On 2017-11-10 09:44:45 +0000, Muddymike said:

Is there anything that actually kills moss and prevents it returning 6
months later? We have a long tarmac drive and large back yard that is
20% moss covered!

Mike

Moss grows where it is not disturbed.
A stiff broom on the tarmac once a week avoids the need for toxic substances.
As for tha 'back yard' - depends what it is. Maybe a rake would work there.

--
Asha

http://minnies.opcop.org.uk/negotiation.htm
Minnies, minnies, everywhere